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Finding the Fourth Proportional to 1,117.36, 1,542 and 651.64

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Solution

The fourth proportional to 1,117.36, 1,542 and 651.64 is: 899.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.36 : 1,542 = 651.64 : x
  2. Step 2: Convert to fraction form
    1,117.36/1,542 = 651.64/x
  3. Step 3: Cross multiply
    1,117.36x = 1,542 × 651.64
  4. Step 4: Simplify right side
    1,117.36x = 1,004,828.88
  5. Step 5: Solve for x
    x = 1,004,828.88/1,117.36
  6. Step 6: Final answer
    x = 899.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.